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Radiation physics, Breast, Mammography, Observer performance, Screening, Physics
E. Salvagnini1, H. Bosmans1, C. Van Ongeval1, A. van Steen1, K. Michielsen1, L. Cockmartin1, L. Struelens2, N. Marshall1; 1Leuven/BE, 2Mol/BE
Results of the study were calculated using the JAFROC software (JAFROC,
The overall significant difference test result for the study was found to be < 0.0001,
showing that at least two of the compared ‘modalities’ i.e.
the T-groups are significantly different.
The alternative free-response receiver operating characteristic curves (AFROC)for the 4 readers are presented in figure 3.
In going from T1 to T4,
the area under the AFROC curve was 0.80,
0.55 and 0.56,
indicating a decrease in detectability with increasing breast thickness.
A typical result,
showing this effect,
is presented in figure 2 where the mass is visible in the first two images (T1 and T2) yet no longer visible in the third and fourth images (T3 and T4).
Results of the comparison of the curves for the different T-groups are shown in table 4.
P-values and the 95% confidence interval are shown. There is no significant difference for T3-T4 comparison (p=0.78) while all the other differences were significant (p<0.05).